Pyrimidine compounds



Patented Mar. 29, 1949 PYRIIHIDINE COMPOUNDS Frederick Robert Basford, Francis Henry Swinden Curd, Francis Leslie Rose, and Harry 'Iacon Openshaw, Manchester, and Roy Hull and Alexander Robertus Todd, Cambridge, England, assignors to Imperial Chemical Industries Limited, a'corporation of Great Britain No Drawing. Application February 18, 1946, Se;-

rial No. 648,552. 2'7, 1945 This invention relates to the manufacture new pyrimidine compounds which are useful as chemotherapeutic agents, particularly as antimalarial agents, and as intermediates in the manufacture of such agents.

We have found that new pyrimidine compounds, useful in the manner indicated and having the formula wherein X and X' may each represent hydrogen or a hydrocarbon radical, Y is hydrogen or a hydrocarbon radical which may optionally bear one or more non-acidic substituents', R" is hydrogen or an alkyl or simply substituted alkyl group, for example an alkoxyalkyl or dialkylamino group, A is a linking group which is aliphatic or alicyclic or aliphatic-carbocyclic and may be substituted, for example, by hydrocarbon radicals, hydroxy or alkoxy groups or dialkylamino-alkyl groups, and, where A or part of A is an aliphatic chain it may be interrupted by oxygen, nitrogen or sulphur atoms, and NRR' is a. strongly basic amino or substituted amino group such as alkylamino or dialkylamino or piperidino or other strongly basic nitrogen-containing heterocyclic group, may be made by a process comprising the interaction of a compound of the formula with a diamine of the formula R'fNH-A-NRR', the various symbolsin these formu'lae having the same meanings as before and Z representing av labile group, such as a halogen atom or a hydrocarbon radical which is attached by an ether or thioether linkage, for example an alkoxy, aryloxy or alkylmercapto group.

It will be appreciated that where it is desired to introduce a substituentof the form --NR"A--NHR, R being hydrogen or a hydrocarbon radical, it will usually be necessary first to protect the terminal amino group of the diamine, as by acylation, and then to remove the protecting group after the condensation with the amino-pyrimidine compound has been effected. This procedure is, in fact, a particular embodiment of one of the modified processes hereinafter to be described.

The reaction is conveniently efi'ected by heating the reagents together, optionally in presence Claims. (01. 260-251) In Great Britain February of a solvent or diluent. The two reagents may both be used as free bases or, if desired, the aminopyrimidine derivative may be used as the free base and the diamine in the form of a salt,

such as the hydrochloride or the acetate, or, alternatively, we may use the free diamine and a salt of the aminopyrimidine derivative. Also, if

desired, the reaction may be carried out in the presence of an acid-binding agent such as sodium hydroxide.

The reagents are conveniently, but not necessarily, used in approximately stoichiometric proportions. If desired, a large excess of the diamine may be used so that it functions as a solvent; indeed with the diprimary diamines itis preferable to work in this way.

0f the 4-halogeno-6-aminopyrimidine-derivatives needed as starting materials 4-chloro-6- amino-2-methylpyrimidine and 4-chloro-6-amino-2:5-dimethylpyrimidine are known compounds; see, for example, Berichte, 1938, vol. 71, p. 92, and 1942, vol; 75, p. 755. Others may be made by the general method there described, namely by interaction of an amino-compound Y-NH2 with the appropriate 4:6-diha1ogenopyrimidine compound, itself obtained by halogenation of the corresponding 4:6-dihydroxy deriva tive with, for example,.phosphorus oxychloride or phosphorus oxybromide. starting materials containing'ether or thioether linkages in the 4-position can readily be made by reaction of the 4-halogeno derivatives with the appropriate hydroxy or mercapto compounds or with alkali metal derivatives of such compounds.

As examples of fi-aminopyrimidine derivatives suitable for use in this process there may be mentioned 4 chloro 6 amino-Z-methyIpyrimidine, 4 chloro 6 amino-2:5-dimethylpyrimidine, 4- chloro-6-amino-S-inethylpyrimidine, 4 chloro- 6 p chloroanilino 2 phenylpyrimidine, 4 chloro-G-p methoxyanilino 2 methylpyrimidine, 4-chloro-fi-p-chloroanilino-2-methylpyrimdine, 4-chloro-6-p-nitroanilino-2-methylpyrlmidine, 4-chloro-6- (6'-bromo-2'-naphthylamino) 2-methylpyrlmidine, 4 chloro-6-p-methoxyanllino-2:5-dimethylpyrimidine, 4-chloro-6-p-chloroanilino-2 S-dimethylpyrimidine, 4-chloro-6-pchloroanilino-2-methyl 5 ethylpyrimidine and 4-chloro-6 p-methoxyanilino-2- methyl-S-ethylpyrimidine and also the corresponding 4-bromo--, 4-ethoxy-, 4-phenoxy and 4-methylmercapto compounds.

As examples of suitable diamines there may be mentioned ethylenediamine, 2-dimethylamino-ethylamine, Z-diethyiaminoethylamine, 3-

The alternative diethylaminopropylamine, S-dimethylaminopropylamine, 4-diethylaminobutylamine, 4-diethylamino-l-methyibutyiamuse, 3-dietnylamino-i;2- dimethylpropyiamine, 3 diethylamaio 2 hydroxyprapyiamne, 2-methylaminoetnyiamine, 3- butylaminopropyiamine. 3 (B diethylaminoethyioxy) -propyiamine, 3-(p-diethylam1noethylmercapto) -propylamine, 5 -diethylamino l-aminopentane, z-pyrrolidinoethyiamine, 1:3-bisdietnylamino-Z-aminopropane. N-ethyl-N-p-dlethylammoethyl-ethyienediamine, z-piperidinoethylamine, 3 piperidinopropylamine, p dimethyiaminoethoxyaniline, p-diethylaminoethoxyaniline, p-diethylaminoethylmercaptoaniline, 3-d1ethylamlno-2z2-dimethylpropylamine, 3-dibutylaminopropylamine, N-methyl-N-fi-diethylaminoethyl-propylenediamine, p p.peridino-pmethyl-ethylamine, N-methyl-N'-diethyl-ethy1- enediamine, N-ethyl-N'-diethylethylenediamine and bis-(p-diethylaminoethyl) -amine.

A further feature of the invention is a modifled process wherein the basic substituent -NR"ANRR.' is introduced by stages. Thus the 6-aminopyrimidine derivative carrying a labile group in the 4-position is brought into reaction with an amino compound of the formula NHR,"A'-B where. A represents either the whole or part of the linking group A defined above and where B stands for a reactive group which is then converted directly or indirectly by methods involving the step of reaction with ammonia or an amino compound into the group NRR' or into a group A"-NRR' such that A and A" together constitute the linking group A. Forv example, thegroup B may be a hydroxy group or a derivative thereof which is. or is readily convertible to, a reactive ester thereof,

propylamine are heated together under reflux for 6 hours. The excess of the dlamine is then distilled off under reduced pressure and the residue is dissolved in dilute hydrochloric acid. The solution is made alkaline by addition of caustic soda and the oil which separates is extracted, with chloroform. The chloroform solution is dried over anhydrous sodium sulphate, the chloroform is distilled ofl and-the residue is distilled in high vacuum whereby 6-amino-4-(ydimethylaminopropylamino) 2:5 dimethylpyrimidine is obtained in the form of a very pale yellow viscous oil. This is dissolved in hot petroleum ether and the solution is cooled whereupon it separates in the form of a colourless hygroscopic solid of MP. 89-91 C. It forms a bis-3:5-dinitrobenzoate of MP. 207.5-209 C.

By starting with the same' chloro-aminopyrimidine and working in the same manner, I

but using other appropriate diamines instead of the y-dimethylaminopropylamine of Example 1, there are obtained the following further compounds.

dimethylpyrimidine of M. P. 99-99.5 C.

By working in the manner described in Example 1 but using as starting materials 4-ch1oro- 8-amino-2-methylpyrimidine and the appropriate diamines there are'obtained the following further compounds.

Example 4 6-amino-4- (8 diethylamino a methylbutyl amino) -2-methylpyrimidine which is a viscous 40 oil which distils at 170 C. under a pressure of pyrimidine compound into reaction with an. acyiated diamine NHR"A'-NHAc and then to hydrolyse off the acyl group. Further, if desired, a terminal amino group may. be modified, as by alkylation, conversion to a heterocyclic group acids or with lower organic acids such as acetic,

lactic, tartaric, and lower alkanesulphonic acids (e. g. methanesulphonic acid) are water-soluble.

i The salts with acids of higher molecular weight,

such as methylene bis-2:3-hydroxynaphthoic acid and methylene bis-salicylic acid are more sparingly soluble in water.

The following examples, in which the parts are by weight, illustrate the detailed practice of the invention.

Example 1 4 parts of 6-amino-4-chloro-2:fi-dime hylpyrimidine and 10.4 parts of y-dimethylamino- Example 5 6-amino-4 (fi diethylaminoethylamino) 2 methylpyrimidine which after distillation in vacuo and crystallisation from a mixture of benzene and light petroleum has M; P. 93.594.5 C.

Example 6 6-amino-4-(Y diethylaminopropylamino) 2 methylpyrlmidine which after distillation in vacuo and crystallisation from a mixture of benzene and light petroleum has M. P. 91-92.5 0.

Example 7 10.16 parts of 4-chloro-6-p-chloroanilino-2- methylpyrim idine, 11.6 parts of fl-diethylaminoethylamine and 0,1 part of potassium iodide are stirred and heated together at 150-160 C. for 8 hours. hydrochloric acid and the solution is filtered from a small amount of insoluble matter and then made alkaline with sodium hydroxide. The precipitate which is formed is filtered oil and extracted with aqueous 5% acetic acid. The acetic acid extract is clarified with decolourisin carbon, sodium hydroxide solution is added and the base which separates out is extracted with chloroform. The chloroform extract is dried over potassium carbonate and the chloroform is distilled off. There remains 6-p-chloroanilino-4-c-diethylaminoethylamino-2-methylpyrimidine which I after crystallisation from petroleum ether (B. P.

-120 C.) forms colourless needles of M. P. 148-149 C.

The resulting melt is dissolved in dilute ,8 hours,

accuses By starting with the same chloropyrimidine and working in the same manner but usingother appropriate diamines instead of the fi-diethylaminoethylamine of Example '7, there are obtained the following further compounds.

Example 8 d-p-chloroanilino-4-Y-diethylaminopropylami no-z-methylpyrimidine, colourless prisms of M. P. 128 C.

Example 9 6-p-ch1oroanilino-4-y-dibutylaminopropylami no-2-methylpyrimidine,colourless needles, M, P. 93-94 C.

Example 10 6 p-chloroanilino-4-7-piperidinopropylamino- Z-methylpyrimidine, colourless fiat prisms, M. 1?. 110 C.

Example 11 8-p-chloroanilino-4-a-diethylamino-a-methyl butylamino-Z-methylpyrimidine, colourless oil. B. P. 222-224 C./0.1 mm.; it forms a dipicrate which crystallises from fi-ethoxyethanol in very small yellow plates, M. P. 149-151 C.

Example 12 6-p-chloroani1ino-4- Y (5' diethylaminoeth 0X1) -propylamino-2-methylpyrimidine, colourless oil of B. P. 245-249" C./0.15 mm.; it forms a dipicrate which crystallises from fi-ethoxyethanol as a yellow crystalline powder, M. P. 181-182 C. The starting material used in Examples 7-12 above, namely, 4-chloro-S-p-chloroanilino 2 the precipitate is filtered off, washed and dried.-

Example 13 25 parts of 4-chloro-fi-p-methoxyanilino-2- methylpyrimidine, 25 parts of B-diethylaminoethyiamine and 0.25 part of potassium iodide are stirred and heated together-at 150-160 C. for

The mixture is then cooled and dissolved in dilute hydrochloric acid and the solution is made alkaline with sodium hydroxide. The base which is precipitated is filtered oil and dissolved in aqueous 5% acetic acid and the-solution so obtained is clarified with decolourising carbon. Sodium hydroxide solution is-then added and the base which separates is filtered ofi', washed with water and dried. There is thus obtained 6-p-methoxyanilino-4-p-diethylaminoethylamino-z-methylpyrimidlne which on crystallisation from petroleum ether (B. P. 100-120 C.) forms colourless prisms of M. P. 146-148 C.

Example 14 By working in a similar manner to that described in Example 13 but using Y-diethylaminopropyiamine instead of fi-diethylaminoethylamine, there is obtained 6-p-methoxyanillno-4-Y- diethylaminopropylamino 2 methylpyrimidine which forms colourless flat prisms of M. P. 130 C.

\ Example 15 16 parts of 4-chloro-6-p-methoxyanilino-2- I methylpyrimidine and 14.4 parts of J-diethylamino-a-methyl-butylamine are stirred and heated together for 7 hours at 150-160" C. The mixture is then cooled and dissolved in dilute hydrochloric acid and the solution is made alkaline with sodium hydroxide and extracted with chloroform. The chloroform extract is shaken several times with 5% aqueous acetic acid. and combined acid extracts are made alkaline with sodium hydroxide and the base which is liberated is again extracted with chloroform. The chloroform solution is dried over potassium carbonate and the chloroform is dissolved ofl. There remains an oil which on stirring with petroleum ether (B. P. 40-60 C.) solidifies. This is G-p-methoxyanilino- 4-8-diethylamino-a-methyl butylamino-2-methlypyrimidine; after crystallisation from petroleum ether (B. P. 60-80 C.) it forms colourless prisms of M. P. 103 C.

The starting material used in Examples 13-15 above is conveniently made by heating together for one hour under reflux 16.3 parts of 4:6-dichloro-2-methylpyrimidine, 12.3 parts of p-anisidine, 80 parts of water, parts of acetone and 2 amino-Z-methylpyrimidine parts of concentrated hydrochloric acid. The mixture is then cooled and the crystals which have separated out are filtered off. They are then suspended in warm alcohol and ammonia is added until all has dissolved and the liquor remains persistently alkaline. Water is then added and the base which separates out is filtered off, washed with water and crystallised from aqueous methanol. There is thus obtained 4-chloro-6-pmethoxyanilino-Z-methylpyrimidine of M. P. 142-143 C.

Example 16 Example 17 6-p-nitro'anilino-4 'y dimethylaminopropyl- .amino-2-methylpyrimidine, which crystallises from toluene in small yellow needles of M. P. 169 C.

Example 18 6-p-nitroanilino 4 'y dibutylaminopropylwhich crystallises from petroleum ether (B. P. -100 C.) in small yellow needles of M. P. 101 C. 1

The 4-chloro-6-p-nitroaniiino-2-methylpyrimidine used as starting material in Examples 16-18 is conveniently made by heating together 4.89 parts of 4:6-dichloro-2-methylpyrimidine, 4.55 parts of p-nitroaniline, 50 parts of acetic acid and 0.05 part of potassium-iodide at 5055 C. for

18 hours. The mixture is cooled, 3 parts of sodium acetate are added and then it is diluted with 250 parts of water. 4-chloro-6-p-nitroanilino-2-methylpyrimidine is precipitated, filtered -off and crystallised from butanol. It forms yellow needles of M. P. Til-272 C.

Example 19 The base may be converted into its dihydrochloride by dissolving in 7% hydrochloric acid and evaporating the solution to dryness in vacuo at 5060 C. The residue so obtained is dried diethylaminoethylamine are heated together for and freed from resmual hydrogen chloride by 6 hours at 150-l60 C. The mixture is then cooled and worked up by the method described in Example 7. There is thus obtained 6-(6'- bromo-2'-naphthylamino)-4 3 diethylaminoethylamino-2-methylpyrimidine which crystallises from petroleum ether (B. D. 100-120 C.) in colourless prisms of M. P. 129-131 C.

By working in a similar manner, but starting from the same chloro compound and using other appropriate diamines instead of the B-diethylaminoethylamine, there are obtained the follow: ing further compounds.

Example 20 6-(6'-bromo 2-naphthylamino) -4-'y-diethylaminopropylamino 2-methylpyrimidine crystallises from petroleum ether (B. P. 100- 120" C.) in colourless fiat prisms, M. P. 129- 13o c. I

Example 21 6- 6' --bromo -2' -naphthylamino) -4-' -dimethylaminopropylamino-2-methylpyrimidine, colourless prisms, M. P. 132-134 C.

Example 22 6-(6'-bromo-2-naphthylamino) -4 -dibutylaminopropylamino-2-methylpyrimidine. colourless prisms, M. P. 91-93 C.

Example 23 6-(6'-bromo 2'-naphthylamino) -4-6-diethylamino-a-methyl-butylamino 2 methylpyrimidine, colourless prisms, M. P. 109-110 C.

The 4-chloro-6- (6'-bromo-2'-naphthyiamino) 2-methylpyrimidine used as starting material in Examples 19-23 is conveniently made by heating 8.15 parts of 4:6-dichloro-2-methylpyrimidine, 10.5 parts of fibromo-p-naphthylamine, 60 parts of water, 40 parts of acetone and 1 part of concentrated hydrochloric acid together for 1 /2 hours under gentle reflux. The mixture is cooled, the solid which has separated oil is filtered ofl and washed with water. It is then dissolved in hot ethanol, ammonia is added untilthe solution remains persistently alkaline and the mixture is poured into water. The solid which is precipitated is filtered off, washed with water, dried and crystallised from toluene whereupon it forms colourless prisms, M. P. 19l-192 C.

Example 24 which peated evaporation to dryness in vacuo at 40-50 C., first with ethanol and then with a mixture of ethylamine and 0.1 part of potassium iodide are stirred and heated together at 150-160 C. for 6 hours. The mixture is then cooled, and dissolved in dilute hydrochloric acid. The solution is'made alkaline with. sodium hydroxide and the base which is liberated is separated oil and extracted with 5% aqueous acetic acid. The acetic acid extract is clarified with decolourising carbon and is then made alkaline with sodium hydroxide. The base which is precipitated is extracted with chloroform, the chloroform solution is dried over potassium carbonate and the chloroform is distilled off. The residual oil is then-distilled under diminished pressure whereby G-p-methoxyanilino-4-fl-diethylaminoethylamino-2 5 dimethyL. pyrimidine is obtained as a colourless oil of B. P. 203 C./0.05 mm.

ethanol and benzene. Finally the dried residue is crystallised from a mixture of alcohol and ethyl acetate, whereby 6-p-methoxyanilino-4-p-diethylaminoethylamino-2 5 diethylaminopyrimidine dihydrochloride' is obtained in the form of colourless prisms of M. P. 254-255 C.

The 4-chloro-6-p-methoxyanilino-2 5-dimethylpyrimidine used as starting material in Exiodide at 40-50 C. for 20 hours. 4 parts of sodium acetate are then added and the solution is poured into 300 parts of water. A solid separates out on standing. This is filtered off, dried and crystallised from n-butanol. It then' forms colo'urless crystals of M. P. 201 C. Example 25 146 parts of 4-chloro-6-p-chloroanilino-2:5-dimethylpyrimidine, 15 parts of fi-diethylaminoethylamine and 0.15 part of potassiuin'iodide are stirred and heated together at ISO-160C. for 8 hours. The mixture is cooled and dissolved in dilute hydrochloric acid and then worked-up by the method described in Example 24. 6-p-chloroanillno-4-fi-diethylaminoethylamino-2 5-dimethylpyrimidine is thus obtained as a colourless oil of B. P. 200 C./0.07 mm. The rlihydrochloride crystallises from a mixture of ethanol and ethyl acetate in colourless prisms of M. P. 263-264" C. 7 By working in a similar manner to that described in Example 25 and using the same chloropyrimidine as starting material but other diamines instead of the p-diethylaminoethylamine, the following further compounds are obtained.

Example 26 6-p-chloroanilino 4 -y diethylaminopropyl- Example 27 6-p-chloroanilino-4-y dimethylaminopropylamino-2: 5-dimethylpyrimidine; this is a solid which crystallises from petroleum ether (B. P. 6080 C.) in colourless prisms of M. P. C. The dihydrochloride crystallises. from a mixture of ethanol and ethyl acetate, M. P. 275-276" C. (decomp.).

Example 28 6.4 parts of p-chloroaniline, 40 parts of water, 20-

parts of acetone and 2 parts or concentrated hydrochloric acid under reflux for 3 hours. A clear solution is obtained. This is cooled and then diluted with water and made alkaline with amform of colourless prisms monia. The solid which separates is filtered of! and crystallised from ethanol. 4-chloro-6-pchloroanilino-2:B-dimethylpyrimidine is thus obtained as colourless prisms of M. P. 176177 C.

Example 29 20 parts of -chloro-6-p-chloroanilino-2- methyl--ethylpyrimidine. parts of p-diethylaminoethylamine and 0.2 part of potassium iodide are stirred and heated together for 6 hours at 140-150" C. The mixture is then cooled and dissolved in dilute hydrochloric acid and the solution is filtered and then made alkaline with sodium hydroxide. A precipitate is formed. The aqueous layer is decanted oil and the residue is dissolved in dilute acetic acid. The acetic acid solution is filtered and made alkaline with sodium hydroxide. The base which. is liberated is extracted with benzene; the benzene extract is dried and the benzene is distilled oil. 6-p-chloroanllino-4-fi-diethylaminoethylamino 2 methyl-5- ethylpyrimidine remains as an oil which is converted into its dihydrochloride by the method described in Example 24. Thedihydrochlo'rlde crystal ises from a mixture of ethanol and ethyl acetate in colourless prisms, M. P. 268-270 C.

(decomp.).

By working in a similar manner using the same chloropyrimidine but other appropriate diamines instead of the B-diethylaminoethylamine there are obtained the following further compounds.

Example B-p-chloroanilino 4 'y diethylaminopropylamino-2-methyl-5-ethylpyrimidine dihydrochloride, M. P. 278-279 C. (decomp.). The correspondlng dipicrate crystallises from ethanol in yellow laminae, M. P. I'll-173 C.

Example 31 G-p-chloroanilino 4 'y diethylaminopropylamino-2-methyl-5-ethylpyrimidine which is a colourless oil, B. P. 210 C/0.065 mm. The dihydrochloride has M. P. 162 C.

The 4 chloro-6-p-chloroanilino-2-methyl-5- ethylpyrimidine used as starting material in Examples 29-31 is conveniently made by heating together 5.73 parts of 4:6-dichloro-2-methyl-5- ethylpyrimidine, 4.3 parts of p-chloroaniline, 30 parts of acetic acid and 005 part of potassium iodide for 20 hours at -45" C. 3 parts of sodium acetate are then added and the solution is poured into water. The precipitate which is formed is filtered off, dried and crystallised from a mixture of benzene and petroleum ether (B. P. 60-80 C.); it forms colourless rectangular prisms of 1 M. P. 166 C.

Example 32 2.75 parts of 4-chloro-6-p-methoxyanilino-2- methyl-5-ethylpyrimidine and 2.5 parts of fi-diethylaminoethylamine are heated together for 8 hours at 155-165 C. and the mixture is then worked up as described in Example 29. There is thus obtained 6-p-methoxyanilino-i-fi-diethylaminoethylamino-Z-methyl 5 ethylpyrimidine dihydrochloride which crystallises from a mixture of ethanol and ethyl acetate in colourless laminae of M. P. 250-251 C. (decomp.).

Example 33 By working in the manner described in Exampic 32 and starting with the same chloropyrimidine but using 'y-dimethylaminopropylamine instead of the fl-dlethylaminoethylamine, there is .gether under reflux for 6 hours.

obtained 6-p-methoxyanilino-4-v-dimethylaminopropylamino 2 methyl 5 cthylpyrimidine which crystallises from petroleum ether (B. P.

80-100 C.) in colourless needles of M. P. 106- 107 C.

The 4-chloro-6-p-methoxyanilino-2-methyl-5- ethylpyrimidine used as starting material in Examples 32 and 33 is made by condensing 4:6-dichloro-2-methyl-5-ethylpyrimidine with p-chloroaniline in acetic acid in presence of potassium iodide exactly as described above for the corresponding 6-p-chloroanilino derivative. It crystallises from dilute ethanol in colourless elongated rectangular prisms, M. P. 157 C.

Example 34 2 parts of 4-chloro-6-amino-S-methylpyrimldine (M. P. 237-238 0., made by halogenation of 4:6-dihydroxy-S-methylpyrimidine with phosphorus oxychloride to yield the 4:6-dichloro compound of M. P. 56.557.5 C. and subsequent reaction with ammonia in ethanol at 140 C. .for 3 hours), 6.5 parts of p-diethylaminoethylamine and 10 parts of B-butoxyethanol are heated to- The p-butoxyethanol and the excess of the diamine are then distilled off under diminished pressure and the residue is further worked up by the method described in Example 1. The fi-amino-i-(fl-diethylaminoethylamino) -5 methylpyrimidine so obtained is a viscous oil which distils at 10- mm. from a bath at 200 C. and after crystallisation from a mixture of benzene and light petroleum has M. P. 95.5-96.5 C.

Example 35 By working in the manner described in Example 34 and starting from the same chloropyrimidine but using 'y-dlethylaminopropylamine instead of thefl-diethylaminoethylamine, there is similarly obtained 6-amino-4-(-y-diethylaminopropylamino)-5-methylpyrimidine of M. P. 93-

Example 36 5.6 parts of 4-chloro-6-(o-diethylamino-a- ,methylbutylamino)-2-methylpyrimidine and 28 parts of B-diethylamino-m-methylbutylamine are boiled together under refiux for 6 hours. The excess of the diamine is then distilled off in vacuo, the residue is dissolved in dilute hydro- 28.9 parts of 4 chloro- 6 hydroxy 2 -methylpyrimidine and 31.6 parts of a-diethylamino-amethylbutyamine are stirred and heated togather at -160 C. for 8 hours. To the viscous melt so obtained parts of phosphorus oxychloride are added and the mixture is heated to reflux for 3 hours. A clear solution is formed. The excess of the diamine is then distilled off in vacuo and the residue is poured onto ice. The solution so obtained is made alkaline with caustic soda and the base which separates out is. ex-

tracted with chloroform. The chloroform solution is dried, the chloroform is distilled oil and the residue is distilled in vacuo whereby 4-chloro- 8-6-diethylamino u-methylbutylamino-2 methylpyrimidine is obtained as a viscous oil i! B. P.

dimethyl-pyrimidine (M. P. aces-210 0., made' by heating 4 6-dichloro-2 E-dimethylpyrimidine with p-nitroaniline for 18 hours at 55-60 C. in glacial acetic acid and in presence of a trace of potassium iodide) 1.8 parts of p-diethylaminoethylamine and 0.018 part of potassium iodide are heated together for 5 hours at'155-165 C. The melt is dissolved in dilute hydrochloric acid and the solution is made alkaline with sodium hydroxide. The base which is precipitated isseparated ofi anddissolved in aqueous 5% acetic acid. The solution is clarified with decolourising carbon and is then made alkaline with sodium hydroxide. The free base, 8-p-nitroanilino-4-s-diethylaminoethylamino-2:5-dimethyl-pyrimidine separates out as an oil. It is extracted with benzene,

the solution is dried, the benzene is distilled oil and the residue is crystallised from petroleum ether (B. P. 60-80 0.). The base is thus obtained in the form of pale yellow crystals of M. P. 104-106 C. The dihydrochloride crystall-ises from a mixture of ethanol and ethyl acetate 'in yellowish prisms of M. P. 254-156 C.

Example 88 Example 39 8 parts of 4- chloro 6 p chloroanilino 2 methyl-5-phenylpyrimidine, 8 parts of 'y-diethylaminopropylamine and 0.08 part of potassium This is most conveniently.

on standing. This is filteredofl. washed with water and dried. alcohol it forms colourless prisms of M. P. 155-. 156 C.

Whereas the above description and examples illustrate many widely varied embodiments of the invention it will be apparent to one skilled in theart that many other embodiments and variations may be devised without departing from the spirit and scope thereof and accordingly it 'is to be understood that the invention is not in salts of the pyrimidine derivatives of the torwherein X and X designate members selected from the group consisting of hydrogen, lower alkyl and phenyl; Y stands for a member 01 the group consisting of hydrogen and aromatic radicals not higher than naphthyl and whereof the nucleus bears a substituent selected from iodide are heated and stirred together at 150- 160 C. for 8 hours. dilute hydrochloric acid and the solution is made alkaline with sodium hydroxide. The base which is precipitated is filtered oil and dissolved in 5% acetic acid. The solution is filtered and made alkaline with. sodium hydroxide and the base which is again precipitated is extracted with chloroform; The chloroform solution is dried and the chloroform is distilled off. The oil-which remains is 4-p-chloro-anilinofi-q-diethylaminopropylamino-2-methyl-5-phenyl-pyrimidine. is crystallised from wet petroleum ether (B. P. g-(W C.) in the form of a hydrate of M. P. 65-

The starting material for this example is made by heating together 10.8 parts of 4:6-dichloro-2- methyi-5-phenylpyrimidine (M. P. 160 0., made by reaction of 4:6-dihydroxy-2-methyl-5 phenylpyrimidine with phosphorus oxychloride), 5.8 parts of p-chloroan'iline and 3 parts of acetic acid at 130-140 C. for 2 hours. The reaction mixture is dissolved in alcohol. The alcohol solution is made alkaline with ammonia andpoured into water. An oil is precipitated which crystallises The melt is then dissolved in the group consisting of halogen, alkoxy and nitro; R." is a member of the group consisting of hydrogen and lower alkyl; A is a linking radical selected from the, group consisting of ali-v phatic, alicyclic-and aliphatic-carbocyclic radicals; while NRR. represents a basic radical selected from the group consisting of monoalkylamines, dialkylamines and piperidine.

2. As new compounds, the free base form and salts of the pyrimidine derivatives or the formula wherein X and X designate members selected from the group consisting of hydrogen, lower alkyl and phenyl; Y stands for a member of the group consisting of hydrogen and aromatic radicals not higher than naphthyl and whereof the nucleus bears a substituent selected from the group consisting of halogen, alkoxy and nitro;

alk is a lower alkylene radical, while NRR' represents a basic radical selected from the group consisting of monoalkylai nines, dialkylamines and piperidine.

3. As new compounds, the free base form and salts oi the pyrimidine derivatives of the formula After crystallisation i'rom 13. 5. As new compounds. the free base form and salts of the pyrimidine derivatives of the formula group consisting of hydrogen, lower alkyl and phenyl; alk is a .lower alkyiene radical, while NRR' represents a basic radical selected from the group consisting of monoalkylamines, dialkylamines and piperidine.

6. As new compounds. the free base form and salts of 8 amino 4 (p diethylamino ethyl amino) -2 :5-dimethyl-pyrimi'dine.

7. As new compounds. the free base form and salts of B-amino-l-(p-diethylamino-etMlamir no) -2-methyl-pyrimidine.

8. Process for the manufacture of pyrimidine compounds as defined in claim mu a bear substituents selected from the group conprises reacting a diamine of the form 8BR?- A-NRR. wherein R", A and 8BR have the same significance as in claim '1, with a pyrimidine compound of the formula N=G-NH-Y eases wherein x and x" designate members selected from the group. consisting of hydrogen; lower alkyl and phenyl; Y stands for a member 0! the group consisting of hydrogen and aromatic group consisting of halogen. alkoxy. arioxy and alkylmercapto, whereby the labile suhstituent is replaced by the radical NRR"ANR 9. Process for the manufacture of compounds as defined in claim 4, which comprises reacting p-diethyiamiho-ethylamine with 4-chloro-6 -pu chloroanilino-z-methyl pyrimidine. 1

10. Process for the manufacture of compounds as defined in claim 5. which comprises. reacting with a dialkylamino-aikylamine upon a i-chloroi-amino-pyrimidine whose 2- and S-positlons sistlng of hydrogen, lower alkyl and phenyl.

FREDERICK ROBERT BASFORD. FRANCIS HENRY SWINDEN CURD. IRANCIS LESLIE ROBE. HARRY TACON OPENSHAW. ROY HULL. ALEXANDER ROBERTUB TODD.

No references cited. 

